7.
Serial Communication Protocol
The GT-321 serial communication protocol supports real time data acquisition using a basic
terminal program such as HyperTerminal.
Communication port setting = 9600 baud, 8 data bits, no parity and one stop bit.
Serial Commands – [ASCII Character(s)]:
0 = Start Counting
Start a one minute count cycle.
1 = Change Size Range
The GT-321 displays five different size ranges. The Change Size Range command is used to
select the next size range. This command is equivalent to pressing the Select Key.
3 = Change Count Units
Toggle between Counts per Cubic Foot (CF) and Counts per Liter (/L).
D0<Enter> = Disable Automatic Records
Do not output a record after each count cycle.
D1<Enter> = Enable Automatic Records
Output a record after each count cycle.
L = Send last record
Output the data from the last count cycle.
? = Display Commands
Output the help menu.
Example Record (CSV – Comma Separated Variable):
SIZE1,COUNT1,SIZE2,COUNT2<LF>
SIZE1
=
Channel one size - fixed size (Note 2)
COUNT1
=
Channel one count
SIZE2
=
Channel two size - selectable size (Note 3)
COUNT2
=
Channel two count
<LF>
=
Line feed
Notes:
1) The GT-321 will display one size range, but the unit actually has two count channels.
2) Channel one size (SIZE1) is fixed at the smallest size (normally 0.3 microns).
3) Channel two size (SIZE2) is selectable using the Select Key or the Change Size Command.
The standard sizes are 0.5, 1.0, 2.0 and 5.0 microns. SIZE2 will default to 0.5microns when
the channel one size (0.3u) is selected.
Page 16 of 18
GT-321 Operation Manual
GT-321-9800 Rev D.doc
AC Tool Supply
877-207-1244
www.aikencolon.com
